/*******************************************************************************
 * Copyright (c) 2000, 2003 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package launching;

import org.eclipse.jdt.launching.IJavaLaunchConfigurationConstants;
import org.eclipse.jdt.launching.IVMInstall;
import org.eclipse.jdt.launching.IVMInstallType;
import org.eclipse.jdt.launching.JavaRuntime;
import org.eclipse.jface.action.ActionContributionItem;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.action.IMenuCreator;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.swt.events.MenuAdapter;
import org.eclipse.swt.events.MenuEvent;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Menu;
import org.eclipse.swt.widgets.MenuItem;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.IWorkbenchWindowPulldownDelegate2;

/**
 * Starts Tomcat
 */
public class StartMenuAction implements IWorkbenchWindowPulldownDelegate2, IMenuCreator, IJavaLaunchConfigurationConstants {
	
	protected Menu menu;

	/* (non-Javadoc)
	 * @see org.eclipse.ui.IWorkbenchWindowActionDelegate#dispose()
	 */
	public void dispose() {
	}

	/* (non-Javadoc)
	 * @see org.eclipse.ui.IWorkbenchWindowActionDelegate#init(org.eclipse.ui.IWorkbenchWindow)
	 */
	public void init(IWorkbenchWindow window) {
	}

	/* (non-Javadoc)
	 * @see org.eclipse.ui.IActionDelegate#run(org.eclipse.jface.action.IAction)
	 */
	public void run(IAction action) {
	}

	/* (non-Javadoc)
	 * @see org.eclipse.ui.IActionDelegate#selectionChanged(org.eclipse.jface.action.IAction, org.eclipse.jface.viewers.ISelection)
	 */
	public void selectionChanged(IAction action, ISelection selection) {
	}

	/* (non-Javadoc)
	 * @see org.eclipse.jface.action.IMenuCreator#getMenu(org.eclipse.swt.widgets.Control)
	 */
	public Menu getMenu(Control parent) {
		return null;
	}

	/* (non-Javadoc)
	 * @see org.eclipse.jface.action.IMenuCreator#getMenu(org.eclipse.swt.widgets.Menu)
	 */
	public Menu getMenu(Menu parent) {
		if (menu != null) {
			menu.dispose();
		}
		menu = new Menu(parent);
		fillMenu();
		initMenu();
		return menu;
	}
	
	protected void fillMenu() {
		IVMInstallType[] types = JavaRuntime.getVMInstallTypes();
		for (int i = 0; i < types.length; i++) {
			IVMInstallType type = types[i];
			IVMInstall[] jres = type.getVMInstalls();
			for (int j = 0; j < jres.length; j++) {
				IAction action = new StartAction(jres[j]);
				ActionContributionItem item = new ActionContributionItem(action);
				item.fill(menu, -1);
			} 
		}
	}
	
	/**
	 * Creates the menu for the action
	 */
	private void initMenu() {
		// Add listener to repopulate the menu each time
		// it is shown in case JREs are added/removed/changed
		menu.addMenuListener(new MenuAdapter() {
			public void menuShown(MenuEvent e) {
				Menu m = (Menu)e.widget;
				MenuItem[] items = m.getItems();
				for (int i=0; i < items.length; i++) {
					items[i].dispose();
				}
				fillMenu();
			}
		});
	}	

}
